How to convert a set to a list in Python

In this Python tutorial, we will discuss how to convert the set to a list in Python. We’ll talk about the procedures and techniques needed to convert the set to a list in Python.

Recently, I was working on a Python Project where we got one requirement that we have to store unique numbers so far this is the reason we used the Python set ..but in cases, if we want to change the number in that case we need the Python list.

We’ll go over easy techniques that make it easy to change a Python set object into a List object.

Here we will see:

• How to convert a set to a list in Python using list()
• Convert a set object to a Python list using frozenset()
• How to convert a set to a list in Python using dict.fromkeys()
• Convert a set object to a Python list using frozenset()
• How to convert a set to a list in Python using for loop
• Convert a set object to a Python list using list comprehension
• How to convert a set to a list in Python using map and lambda
• Convert a set object to a Python list using unpack

Convert set into a list in Python

There are numerous ways to convert a set to a list. But first, let’s quickly explain a Python set and list.

Sets are the iterable and mutable unordered collection of data types in Python.

Python uses lists to store the sequential order of different kinds of data. Because Python lists are mutable types, we can change their elements after they’ve been generated.

How to convert a set to a list in Python using list()

• In this section, we will discuss How to convert a set to a list in Python by using the list() method.
• Iterators like a set, tuple, or dictionary are converted into lists by the list() method. This method can easily convert the Python set into a list.
• The output of the list() function will be a list with the same elements if you provide the Python set as a parameter in the list() function.

Syntax:

Here is the Syntax of the list() method in Python.

list(iterator)

Note: This method takes only one parameter and it defines the iterator such as set and tuple etc.

Example:

Let’s take an example and check How to convert a set to a list in Python by using the list() method.

Source Code:

# define set
Bikes_in_USA = {'Aprilia, Kawasaki, Ducati'}

# By Using list() method 
new_output = list(Bikes_in_USA)

# Display the new list
print("Convert set into list :", new_output)

In the following given code first, we created the set named ‘Bikes_in_USA’. Next, we want to convert the input set to a list. For this, we used the list() method and within this method, we passed the input iterable as an argument.

Here is the implementation of the following given code

This is how to convert a set into a list in Python by using the list method.

Read: Python convert tuple to list

Convert a set object to a Python list using frozenset()

• Now let us discuss how to convert a set object to a Python list using frozen().
• The function frozenset() returns a new frozenset object with the option of iterative elements and it is an immutable unordered collection of data items.
• Use the list function to convert this set into a list and provide the set as an argument to receive the list object as an output.

Syntax:

Let’s have a look at the Syntax and understand the working of the frozenset() method in Python.

frozenset([iterable])

Note: This method takes only one parameter and it defines the iterator such as set and tuple etc.

Example:

Let’s take an example and check how to convert a set object to a list in Python by using the frozenset() method.

Source Code:

# Input set
Country_name = {"U.S.A, Germany, Australia"}
new_val=frozenset(Country_name)

# Convert them into a list by using the list() method
result= list(new_val)
# Display the new list
print("Converted into list :", result)

In the above code first, we initialize the set by using the curly brackets{}. Next, we used the frozenset() method and inside the method, we passed the input set.

After that, we used the list() method to convert the input set into a list.

Here is the Screenshot of the following given code

As you can see in the Screenshot we have discussed how to Convert a set object to a list in Python by using the frozenset method.

Read: Python string to list

How to convert a set to a list in Python using dict.fromkeys()

• In this section, we will discuss How to convert a set to a list in Python by using the dict.fromkeys() method.
• The dict.fromkeys() method builds a new dictionary using the iterable (string, list, set, or tuple) that is provided as keys and the value that is specified and then used the list method to convert them into the list.

Syntax:

Here is the Syntax of dict.fromkeys() method in Python.

dictionary.fromkeys(sequence, value)

• It consists of a few parameters
  • sequence: An iterable object called a sequence will act as the new dictionary’s key.
  • value: By default, it takes none value and it is a value of each key.

Example:

Let’s take an example and check how to convert a set to a list in Python by using the dict.fromkeys() method.

Source Code:

# define set
state_name_in_USA = {'Alaska','Hawaii', 'Colorado '}

# By Using list() method 
new_output = list(dict.fromkeys(state_name_in_USA))

# Display the new list
print("Convert set into list :", new_output)

In the given example, we define the input set named ‘state_name_in_USA’. Next, we used the list() method and within this method, we used the concept of dict.fromkeys() method to get the values and store them in a list.

You can refer to the below Screenshot.

In this example, we have understood How to convert a set to a list in Python by using the dict.fromkeys() method.

Read: Python dictionary values to list 

Convert a set object to a Python list using frozenset()

• In this example, we will discuss how to convert a set into a list in Python by using the sorted method.
• The built-in Python function sorted() produces a sorted list from the given list. It accepts strings, integers, and both object types.
• We can easily use the sorted() method to convert the set to a list in python. In this method, we cannot store integer values and strings at the same time.

Syntax:

Here is the Syntax of the sorted() method in Python.

sorted(iterable, key, reverse)

Example:

Here we will take an example and check how to convert a set into a list in Python by using the sorted method.

Source Code:

# Input set
Cars_in_USA ={ "Ford F-150, BMW"}

# By using the sorted() method
new_result = sorted(Cars_in_USA )

# Display the new list
print("Convert set into list :",new_result)

In the following given code, we used the sorted() method to convert the given set into a list. After executing the code the output displays a new list.

Here is the execution of the following given code.

This is how to convert a set object to a list in Python by using the sorted method.

Read: How to Reverse a List in Python

How to convert a set to a list in Python using for loop

• The set will be iterated over using a for loop, and each element will be appended to the list using the append() method.
• The append() method in Python adds a new item to the end of the list. By updating the list, it adds an element. The method doesn’t give itself back.

Syntax:

Here is the Syntax of the list.append() method in Python

list.append(item)

Note: The item parameter defines the elements to be added at the end of the list.

Example:

Let’s take an example and check How to convert a set to a list in Python by using the for loop.

# Initialize the set
new_values = {562, 2673, 9256, 914}
empty_list = []
for m in new_values:
    empty_list.append(m)
print(empty_list)

In the above code, we initialize the input set and then create an empty list in which the result will be stored. Next, we used the for loop to iterate the values and used the append() function to store the values in a list.

You can refer to the below Screenshot.

This is how to Convert a set to a list in Python by using the for loop.

Read: How to add string to list Python

Convert a set object to a Python list using list comprehension

• In this section, we will discuss how to convert a set object to a list in Python by using the list comprehension method.
• List Comprehension is a different way to concatenate two lists in Python. Basically, list comprehension involves creating a list of elements based on an already existing list.
• A list can be generated from any existing iterable object in a simple way using list comprehension and it is used to create lists using for loop in a different way.

Example:

Here we will take an example and check how to convert a set object to a list in Python by using the list comprehension method.

input_set = {67, 28, 19, 28, 99}

new_result = [i for i in input_set]
print("Converted list is:", new_result)

In the above code, we defined the input set and then use the list comprehension method to convert them into a list.

Here is the Screenshot of the following given code.

In this example, we have understood we Converted a set object to a list in Python by using the list comprehension method.

Read: Python program to loop through a list

How to convert a set to a list in Python using map and lambda

• Here we will discuss how to convert a set to a list by using the map and lambda function in Python.
• A lambda function in Python is an anonymous function, meaning it has no name. It is a simple function with just one expression and any number of inputs.
• Without directly utilizing a for loop, you can process and transform each item in an iterable using Python’s built-in map() function.

Syntax:

Here is the Syntax of the lambda function in Python

lambda argument(s): expression

Example:

Let’s take an example and check how to convert a set to a list in Python by using the map and lambda functions.

Source Code:

# Initialize the set 
Cars_in_USA ={ "Range Rover, BMW"}

# By using map and lambda function
new_output = list(map(lambda l: l, Cars_in_USA))

# Display the list
print("Converted list is:", new_output)

In the following given code, we initialized the set named ‘Cars_in_USA’ and then used the map and lambda function.

Here is the Screenshot of the following given code

This is how to convert a set to a list in Python by using the map and lambda function.

Read: How to get string values from list in Python

Convert a set object to a Python list using unpack

• In this example, we will discuss how to convert a set to a list by using the unpack method in Python.
• In this method, we extract the set within the list literal in order to transform it into a list. The * sign, which stands for every element in the set, must be used.
• In this case, the * operator is also referred to as the set (or iterable) unpacking operator. It enhances the unpacking feature by enabling us to collect or pack numerous values into a single variable.

Example:

Here we will take an example and check how to convert a set to a list by using the unpack method in Python.

Source Code:

# defined Set
Country_name = {(67, 'U.S.A'), (25, 'France'), (96, 'Germany'),(15, 'Australia'), (34, 'China')}

# Unpack the set
new_result = [*Country_name]

# Display the Content
print("Converted list is:", new_result)

You can refer to the below Screenshot.

You may also like to read the following Python tutorials.

• Python program to select from a list
• How to Convert a list to DataFrame in Python
• Python program for list comprehension lambda
• How to convert a dictionary into a string in Python
• Python program for list comprehension using if-else
• Check if a list exists in another list Python
• Python List pop() method [With Examples]
• Python List count() method [With Examples]

In this Python tutorial, we have discussed how to convert the set to a list in Python. And also we have covered the following given methods

• How to convert a set to a list in Python using list()
• Convert a set object to a Python list using frozenset()
• How to convert a set to a list in Python using dict.fromkeys()
• Convert a set object to a Python list using frozenset()
• How to convert a set to a list in Python using for loop
• Convert a set object to a Python list using list comprehension
• How to convert a set to a list in Python using map and lambda
• Convert a set object to a Python list using unpack